Zotpress seconds instead of day displayed in "accessed"-date (2 posts)

I already posted this in the Zotero forum, but since the date issue doesn't occur when I generate the citation in Zotero, they suggested to post it here:
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First of all, sorry, I'm not a techie. But I've the following format problem. I'm using Zotero (in german), Firefox (in german) and WordPress (3.4.1 in german) with Zotpress (4.5.4).
The retrieved-date in Zotero citations is displayed incorrectly in WordPress, no matter what citation style I chose in Zotpress. It displays the second instead of the day, e.g
In Zotero / retrieved: 2012-06-27 10:12:33
translates to
Wordpress/Zotpress bibliography citation: ...[Accessed June 33, 2012]

Any idea what I could do? ...apart from manually deleting the times in all my Zotero entries :-(
The date format in our WordPress installation is: 27. Juni 2012